Import BSDDB 4.7.25 (as of svn r89086)
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Zachary Ware
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docs/gsg/JAVA/dbErrorReporting.html
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147
docs/gsg/JAVA/dbErrorReporting.html
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Error Reporting Functions</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.62.4" />
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<link rel="home" href="index.html" title="Getting Started with Berkeley DB" />
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<link rel="up" href="DB.html" title="Chapter 7. Databases" />
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<link rel="previous" href="DBAdmin.html" title="Administrative Methods" />
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<link rel="next" href="CoreEnvUsage.html" title="Managing Databases in Environments" />
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</head>
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<body>
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<div class="navheader">
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Error Reporting Functions</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="DBAdmin.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 7. Databases</th>
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<td width="20%" align="right"> <a accesskey="n" href="CoreEnvUsage.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="dbErrorReporting"></a>Error Reporting Functions</h2>
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</div>
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</div>
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<div></div>
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</div>
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<p>
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To simplify error reporting and handling, the
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<span><tt class="classname">DatabaseConfig</tt> class</span>
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offers several useful methods.
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<tt class="methodname">DatabaseConfig.setErrorStream()</tt>
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</p>
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<p>
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Sets the
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<span>Java <tt class="classname">OutputStream</tt></span>
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to be used for displaying error messages issued by the DB library.
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</p>
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</li>
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<li>
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<p>
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<tt class="methodname">DatabaseConfig.setMessageHandler()</tt>
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</p>
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<p>
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Defines the message handler that is called when an error message is
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issued by DB. The error prefix and message are passed to
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this callback. It is up to the application to display this
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information correctly.
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</p>
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<p>
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Note that the message handler must be an implementation of the
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<tt class="classname">com.sleepycat.db.MessageHandler</tt>
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interface.
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</p>
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</li>
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<li>
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<p>
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<tt class="methodname">DatabaseConfig.setErrorPrefix()</tt>
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</p>
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<p>
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Sets the prefix used for any error messages issued by the
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DB library.
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</p>
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</li>
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</ul>
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</div>
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<p>
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For example, to send all your error messages to a particular message
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handler, first implement the handler:
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</p>
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<a id="java_db10"></a>
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<pre class="programlisting">package db.GettingStarted;
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import com.sleepycat.db.Environment;
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import com.sleepycat.db.MessageHandler;
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public class MyMessageHandler implements MessageHandler {
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// Our constructor does nothing
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public MyMessageHandler() {}
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public void message(Environment dbenv, String message)
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{
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// Put your special message handling code here
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}
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}</pre>
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<p>
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And then set up your database to use the message handler by identifying
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it on the database's <tt class="classname">DatabaseConfig</tt> object:
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</p>
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<a id="java_db11"></a>
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<pre class="programlisting">package db.GettingStarted;
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import com.sleepycat.db.DatabaseConfig;
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...
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DatabaseConfig myDbConfig = new DatabaseConfig();
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MyMessageHandler mmh = new MyMessageHandler();
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myDbConfig.setMessageHandler(mmh); </pre>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="DBAdmin.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="DB.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="CoreEnvUsage.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Administrative Methods </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Managing Databases in Environments</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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